AIBU to be a bit scared of what I've just seen in my shed

Pictured here. I think I've seen these before but not so many or so big. I thought they were just some feature in the wood of a cheap shed but now I realise something or somethings have actually (gulp) built them. It looks like something(s) is living in them. I saw something winged on one of them then I ran away.

Ive got several in my shed. All of them old and not used anymore. I was just careful not to make the shed vibrate too much when getting things out, when they were 'live'. Never had a problem with them. I think they're rather beautiful and reminds me of how amazing nature is.

Agree wasps nests or bykes as we call them here.If you can get someone to get rid of the inhabitants, the nests themselves are beautiful intricate things and worth keeping. Dcs will get brownie points at show and tell...

We had a wasps nest like this in our play house. DH wrapped himself up in all the clothing he owns, and pulled it down himself. Ours was only tiny, only about 4 wasps flew out. We cut it open and it was full of little larvae inside.